Advice on buying turntable under $500

For 350 bucks this Pioneer PLX-500 direct drive should be a nice fit!
https://www.zzounds.com/item--PIOPLX500

Save more money and get something better.

Depends on what you want, and what you mean by "showing its age". A table from the 70's can still be fine but the bearing will go dry if not cleaned and lubed in all that time. Same thing with the arm. Cartridge could even be shot. In a world where every little thing matters you're just not giving us much to go on. 

Also if the goal is sound quality the receiver is probably a whole lot weaker than the table. 

You might want to consider a little refurbishment of what you have, along with a new cartridge, as a lot more bang for the buck than a whole new table. 

That said, if you like the Fluance get the Fluance. It for sure will be a big improvement- if for no other reason than it comes with a new MM cartridge, which is probably what you really need.

Hi,
unless your tt has no issues, a new mm cartridge would be wiser and save you some money. Something like a Nagaoka MP-150/200 would be quite good.